A 23 year-old man is in a critical condition after being assaulted at the Hastings TOP 10 Holiday Park early this morning.

Detective Sergeant Darren Pritchard said they were called to the incident shortly after 8am and found a man with serious injuries.

The man had to undergo surgery at Hawke's Bay Hospital and was in a critical condition.

Police had launched an investigation and believed a weapon was used by the attacker.

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"A number of people were present at the time and we are speaking with them as part of our enquiries," Detective Sergeant Darren Pritchard said.

A staff member said said she was unsure whether it was a guest or one of their friends who was injured.

The room was booked as having four people stay in it but they had invited friends over at some stage she said.

The guests who were staying at the holiday park during the assault had since checked out.

Police were still searching for the person responsible.